Rotary pump.



P. J. MATGHETTE & F. WJVAN NBSS ROTARY PUMP.

APPLICATION FILED MAYQ, 1910.

Patented Feb. 24, 1914.

2 SHEETS-SHEET 1.

W w t m WW M v a m w 6 FWW L J\m m r i \w y K M Q 5 s mi E 3 i NW E Q: w2 R W 8 K .P. J. MATGHETTB & P. W. VAN NESS.

ROTARY PUMP.

APPLIOATION FILED MAY 9, 1910.

Patented Feb. 24, 1914.

2 SHEETS-SHEET Z.

Wit nesse 6 P lllhllTED STATES PATENT OFFICE.

SAID VAN NESS ASSIGNOR TO SAID BIATCHETTE.

ROTARY PUMP.

Specification of Letters Patent.

Patented Feb. 24, 1914.

Application filed May 9. 1910. Serial No. 560,293.

' NHL/H an, Fawn J. :hlATUIP T .s:;, citizens oi nub. at Milwaukee,wuuux or .lliluauliec and State of u, blue in, entcd certain new androvcnxeots in hotary Pumps, 01 f'hll r lug is u specification, referhadto the accompanying drawing wort thereof. mention relates to pumps ofthe and the pump which is the subot this invention is especiallypinnpiug air to create a vacuuuu cleaning systems and the of thisinvention are to imgu'm-i .ti'uction of rotary pumps in he manner to bemore specifically described olain'ied.

..\t e111 to the drawings which accompni this specification and form apart th .i' and on which drawings the same i'e'htreuce characters areused to designate the. same elements wherever they may apin. each of theseveral views, and h drawings illustrate embodiments of invention,Figure l is a vertical trans- Vt section of the pump casing taken on theline a-o., Fig. 2, looking in the direction indicated by the arrows, theends of the rotor. buciiets and wearing strips being shown in elcv: ion;Fig. 2 is a longitudinal vertical section of the pump taken on the Q. 1,looking in the direction indicated b the arrows; Fig. 3 is a verticalleuwitudinal section of the pump casino; Ytor and ends of the pump beingomitted l valien on the line b--b, Fig. 1, and looking in the. directionof the arrow marked a; and 4 is a View similar to Fig. 3, but looking-inthe opposite direction, or the direction of the arrow (5.

Referring specifically to the drawings, the reference numeral 1designates a pump casingwhich is provided with a cylindrical bore 2, supiiorting lugs 3, an inlet chamber 4-, outlet. or exhaust.- chamber 5,inlet port 6 and exhaust port 7. The cylindrical bore 2 of the casing isin communication with the inlet chamber 1 by means of inlet ports 8 andwith the exhaust chamber 5 by means of exhaust ports 9 and relief ports10. The inlet ports 8 are preferably formed in the casing elongatedslots running circumfercntiallv and diagonally Wltll respect to i thebore 2 of the casing, so that the Wearing 1 effect both on the casingand on the wearing g strips will be reduced to a minimum by alt lowingplenty of contact surface for the l wen-ring strips as they pass oversaid ports, and the exhaust ports 9 are similarly arrangedcimcumfercntially and diagonally with respect to the bore 1-1 of thecasin This diagonal arrangement. of the ports provides for an evenwearing of the Wearing strips and the bore of the casing, and also,provides for rolling or shearing dust' and dirt, which may be caught atthe edges of said ports, into and out of said ports, in a manner whichwill be readily understood.

The pump is provided with heads 10 and 110. which are preferably bothremovable from casing 1 and which may be secured to the casing 1 in anysuitable or preferred manner. The heads 10 and 110 are ardvidcd withelorgated bearings 12 and 1, respectively to afford ample bearingsurfaces for the rotatable shaft 14 of the pump, and aijiti-frictionbushings 15 and 16 of any suitable or preferred material may beinterposed between shaft 14 and bearings 12 and 13. One end of shaft: 1L projects from its bearings and may be directly connected with anelectric or other form of motor, or may have a pulley wheel securedthereto for running the pump, and this end of the shaft 14 whichprojects from its bearing, is preferably provided with packing 17retained in place by a gland 18, While the end of the bearing ifi theother head of the pump is closed byn. plate or cap 19. The purpose ofcap 19 and packing 17 is to keep oil fed to the bearings through oilholes 20 and 21, from escaping from the pump, and compel it to flow intothe body of the pump or the bore 2 of the casing, to lubricate therotor, buckets and wearing strips therein.

The rotor 22 may be constructed in any suitable or preferred manner. butit is preferred to construct it as a substantially cylindrical body withthe shaft 14 concentrically located :with respect thereto, but with saidshaft eccentrically located with respect to heads 10 and 110 of thepump, so that the circumference of rotor 22 is substantially in contactwith the interior of bore 2 at the bottom or lowermost part thereof, asclearly shown by Fig. 1 of the drawings.

The pump is preferably provided with four buckets, though a greater orless number may pf course be provided for, and

these buckets are provided with Wearing strips which are designated bythe reference numerals 223i 2%., 25 and 26. The wearing strips havetheir-outside surfaces curved to correspond with the curve of the bore 2of the pun'zp, and their inside surfaces are preferably made flat. asclearly s" l of the drawings, and are provided with projectionsdesignated by the common reference numeral, 27., which preferably extendthroughout their length. The weering strips 23 24', 25 and are inreality the casing; contact ends of the radially movable buckets 228, 5230 and 31, which are received within. radial slots 32. 33, 34 and 35respectively, fenced in the rotor 22, and which slots open at theirexterior into recesses 86, 37, 38 and 39, formed on the exterior ofrotor adapted to receive the wearing, strips iZ-l, and 26 respectively,sothat uheu said wearing strips are re ceived within said recesses theyform with rotor 22 a r ihstantially smooth cylindrical surface.Preiershly the wearing strips 23, 24, 25 and :16 are formed of analuminum alloy such as McAdamite, or other light metal, and the buckets28. 529, 30 and 31 are likewise formed of the same metal or othersuitable light metal, and said buckets are made hollow or cored out tofurther decrease theirweight, and preferably the buckets are open attheir inner ends so that the hollow interiors thereof are in opencommunication with slots 32 and 35, so that oil can pass from ss idslots into the hollow interiors of the buclnats. The several bucketshave formed in their outer edges recesses or sockets which aregireferably a little more than seini-cylindrical in cros section so asto receive the suhslair ly cylindrical wearing strip rods l0 ll. and 43,which are secured to the projection 27 on the wearing strips 523, 21 25and by means of pins 44, or other suitable fastening means. Oil holes l5are drilled, or otherwise made, to allow oil to flow from-1 the hollowinteriors of the buckets into the sockets in the outer edges of thebucket-s, to lubricate the wearing strip rods. It preferred. to have thebuckets and wearing strips freely movable with respeet to rotor 22. sothat they are thrown out centrifugal force, and it is preferred to makethe buckets and wearing strips of as light weight possible in the mannerheretofore described, for the purpose of re ducing the friction betweenthe wearing strips and the interior of the bore of the cusing. Thejirimury functionof the wearing strip rods ll), 4-1, and -13, is toprovide a resisting material. between the buckets I raring strips sothat friction will and the life of the movable parts 'll be lengthened.and whei the wearing strips are made from an aluminum alloy. such, forexample,

hown by McAdamite, the Wearing strip rods are preferably made fromsteel. This construction gives extreme lightness to the wearing stripsand buckets while at the same time it reduces friction by providingmetal of dif ferent character at all friction surfaces The reason formaking the buckets and the wearing strips from a light metal is toreduce the centrifugal force created by these parts when in motion, andconsequently to reduce the friction between the wearing strips and thepump casing.

It will be readily understood that oil in the bottom of the cylindricalbore 2 in the pump casing 1 will creep by capillary at traction betweenthe buckets and the sides of the slots in which the buckets are receivedand this action will be increased by the pumping action of the bucketssliding into the slots as the buckets are coming to their lowermostpositions. The oil. will then pass into the interiors of the hollowbuckets through their inner, open ends b creeping, or capillaryattraction or by centrifugal force or gravity according to the speed ofthe rotor, and will then pass through oil holes to luhricatethe wearingstrip rods.

The operation of the pump is as followsz The rotor is rotated in thedirection indicated by the arrow on Fig. l of the draw- 'ii'igs and thebuckets and wearing strips are thrown. outwardly by centrifugal force,so that the wearing strips bear against the inside of the bore 2 at allpoints during; their revolutions. Air enters between each pair ofbuckets as they niss the inletepois 8, and before a leading bucketuncovered the relief ports 10 the following bucket has passed the endsof ports 8 so that the air is "pocketed between the two buckets. Becauseit is not desirable to waste energy by compressing the air contained ina pocket formed between two buckets. the relief ports 10 are provided,throu h whi the sir can escape into the exhaust chamber 5 soon after theinlet ports have been closed, and be fore the preceding bucket hasreached the exhaust ports 9 and before the air h been coii'ipressed. Therelief ports 10 .m be made longer circmnferentially and the ex.- haustports 9 might be made shorter circun'iferentielly, but it found inpractice that, with the said ports of substantially the proportionsshown by the drawings, extreme etliciency and economy are realized.

What is claimed is:

1. The combination in e rotary pump of a casing provided with a bore, arotor eccentriially disposed within said bore. buckets of a light weightmaterial carried by said rotor and movable with respect thereto,wearingv strips of light weight material carried by said buckets andmovable with respect thereto, and wear-resisting and friction reducingmaterial between said buckets and said wean j ing strips, saidwear-resisting and frictionreducing material being movable with respectto the said buckets to hinge the wearing strips thereto.

2. The combination in a rotary pump of a casing, provided with a bore, arotor eccentrically disposed within said bore, buckets of a light weightmaterial, such as aluminum or an aluminum alloy, carried by said rotorand .movable with respect thereto, wearing strips of a. light weightmaterial, such as aluminum or an aluminum alloy, carried by saidbuckets, and steel wearing strip rods uniting said buckets and saidwearing strips. the said steel Wearing strip rods being movable-withrespect to the buckets and hinging the said wearing strips to the saidbuckets.

3. The combination in a rotary pump of a vasin r, provided with a bore,a rotor eccentrically disposed within said bore, hollow or chamberedbuckets of aluminum or an aluminum alloy carried by said rotor andmo'vable with respect thereto, wearing strips of aluminum or an aluminumalloy, said buckets being provided with sockets in their outer ends, andsteel wearing strip rods secured to said wearing strips and seated inthe sockets in said buckets.

4. The combination in a rotary pump of a casing provided with a bore, arotor eccentric-ally disposed Within said bore and pro vided with slots,open-ended hollow buckets provided with sockets seated in said slots,wearing strip rods movably received Within said sockets, and wearingstrips to which said wearing strip rods are secured, said buckets beingprovided with oil holes affording communication between the hollowinteriors of said buckets and said sockets.

In witness whereof We hereto :iflix our signatures in presence of twoWitnesses.

FRANK J. MATCHETTE. FRANK W. VAN NESS.

\Vitnesses CHAS. L. Goss, JENNIE PAIKoWsKI.

